math.atan2_带有Python示例的math.atan2（）方法

math.atan2

Python math.atan2()方法 (Python math.atan2() method)

math.atan2() method is a library method of math module, it is used to get the arc tangent value of "y/x" (i.e. atan(y/x)), it accepts two numbers and returns arc tangent of "y/x".

math.atan2()方法是数学模块的库方法，用于获取“ y / x”的 反正切值(即atan(y / x) )，它接受两个数字并返回“ y”的反正切/ x” 。

Note: math.atan2() method accepts the only number, if we provide anything else except the number, it returns error TypeError - "TypeError: a float is required".

注意： math.atan2()方法接受唯一的数字，如果我们提供除数字以外的其他任何内容，它将返回错误TypeError- “ TypeError：需要浮点数” 。

Syntax of math.atan2() method:

math.atan2()方法的语法：

    math.atan2(y, x)

Parameter(s): y, x – are the numbers whose arc tangent to be calculate (i.e. atan(y/x)).

参数： y，x –是要计算其反正切值的数字(即atan(y / x) )。

Return value: float – it returns a float value that is the arc tangent value of the numbers y/x.

返回值： float-返回一个浮点值，该值是数字y / x的反正切值。

Example:

例：

    Input:
y = 0.2345
x = 1.234
# function call
print(math.atan2(y, x))
Output:
0.18779323183177443

Python代码演示math.atan2()方法的示例 (Python code to demonstrate example of math.atan2() method)

# python code to demonstrate example of 
# math.atan2() method 
# importing math module
import math
# numbers
x = -1
y = 1
print("atan2(",x,",",y,") is = ", math.atan2(x,y))
x = 0.2345
y = 1.234
print("atan2(",x,",",y,") is = ", math.atan2(x,y))
x = -5
y = 5
print("atan2(",x,",",y,") is = ", math.atan2(x,y))
x = 10
y = 20.23
print("atan2(",x,",",y,") is = ", math.atan2(x,y))

Output

输出量

atan2( -1 , 1 ) is =  -0.7853981633974483
atan2( 0.2345 , 1.234 ) is =  0.18779323183177443
atan2( -5 , 5 ) is =  -0.7853981633974483
atan2( 10 , 20.23 ) is =  0.45908957477179374

TypeError example

TypeError示例

# python code to demonstrate example of 
# math.atan2() method with an exception
# importing math module
import math
# numbers
x = "2"
y = "34"
print("atan2(",x,",",y,") is = ", math.atan2(x,y))

Output

输出量

Traceback (most recent call last):
File "/home/main.py", line 10, in <module>
print("atan2(",x,",",y,") is = ", math.atan2(x,y))
TypeError: a float is required